New Global Curve-Fitting Method Using Frequency Response Function

J. Ocean Eng. Technol. 2009;23(6):82-86.

Min Cheon-Hong,Park Han-Il,Bae Soo-Ryong,Jeon Jae-Jin

Graduate School of Korea Maritime University,Department of Ocean Engineering Korea Maritime University,Agency of Defence Development,Agency of Defence Development

주파수 전달함수를 이용한 신 포괄 곡선맞춤법

민천홍,박한일,배수룡,전재진

한국해양대학교 대학원,한국해양대학교 해양공학과,국방과학연구소,국방과학연구소

Keywords: Structural vibration, Curve-fitting, Frequency response function, Nonproportional damping, System identification, Experimental modal analysis

핵심용어: 구조진동, 곡선맞춤, 주파수 전달함수, 비비례 점성, 시스템추정, 실험모드해석

Abstract

Several damping materials have been employed to reduce the vibration of structures. While it is important to estimate the damping matrix when analyzing damped composite structures using the finite element method (FEM), at present, there is no FEM program that can correctly estimate the damping matrix. In this paper, a new global curve-fitting method is proposed for identifying the system parameters of non-proportional damping structures using a frequency response function. An experimental test for a cantilever beam attached damping material was carried out to verify the performance of the method proposed in this study.